Question

Design a buffer that has a pH of 4.36 using one of the weak base/conjugate acid systems shown below. Weak Base Conjugate Acid pk, CH3NH2 C6H1503N C3H5N 4.2x10-4 CH3NH3" 5.9x10-7 C6H1503NH 1.5x10-9 C;H3NH 2.4*10-11 1.7x10-8 6.7x10-6 10.62 7.77 5.17 How many grams of the bromide salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams bromide salt of conjugate acid = grams weak base =

Answer 1

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To form a buffer with pH of 4.36 Uue celect CHN 14-pH = 9.64 4.36 PH sHNBO CsHN H8T Salt bose Рон poH .2 oCstNHBr L 9-64 CsHsNHB Ghren IMOF IL O.82.= SsHSNHB weak bose stN Number ot mde of ueak base i, CsH.N= molxiL CeshsNHB So lo Imo moles of CsHgNnBr = 6.61 Moles mass of HNHB rz molay mass x moles 160gp x 6.61 mol = {|0S7.G may of wea k basa e, CsH<N molar mau x mole X 1 Mols Scanned with CS Cam'Scanner